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Journal of Experimental Biology 79,47-58 (1979)
Published by Company of Biologists 1979

An Analysis of Acid-Base Disturbances in the Haemolymph Following Strenuous Activity in the Dungeness Crab, Cancer Magister

D. G. McDONALD ¹, B. R. McMAHON ², and C. M. WOOD ¹

¹ Departments of Biology, University of Calgary, Calgary, Alberta, Canada, T2N 1N4; Department of Biology, McMaater University, Hamilton, Ontario, Canada L8S 4K1
² Departments of Biology, University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Enforced activity causes a marked depression of haemofymph pH in Cancer magister. Both lactate concentration and P_COCO2 of the haemolymph are elevated immediately following exercise but resting P_COCO2 is restored within 30 min whereas resting lactate levels are not restored for at least 8 h. The haemolymph acid-base disturbance is caused largely by elevated haemolymph lactate levels but a Davenport analysis based on measurements of pH and total CO₂ reveals a marked discrepancy between the amount of metabolic acid buffered by the haemolymph and the lactate anion concentration. This appears due to a more rapid release of lactate from the tissues than H⁺ ions produced with lactate.

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